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+disp("np0=n0p+(g*τe)");
+n0p=4.5*10^5;
+g=10^15;
+a=10^-5; //say a=τe
+np0=n0p+(g*a);
+printf('\n The value of np0 is %fcm^-3',np0);
+t=-a*log(n0p/np0);
+printf('\n The value of t is %fms',t*10^3); \ No newline at end of file